Process for making photostereotypes for typographic printing-presses.



clear, and exact description.

cnannns snncnnna, or nomroc, onm'ronme.

PROCESS FOR MAKING- PHO'IOSTEREOTYPES FOR TYPOGRAPHIC PRIIi'TING-PRESSES.

weenie,

No Drawing.

Specification of Letters Patent.

' Application filed March 28, 1913. Serial No. 757,367.

Patented Feb. 24, 1914.

To all whom it may concern:

Be it known that 1, Cinemas BAnoHLnR, a citizen of the United States, and a resident of Lompoc, inthe county of Santa Barbara and State of California, have invented a new and Improved Process for Making stereotypes for Typographic rintmg- Presses, of which the following is a full,

The invention relates to the process of making printing blocks directly from any negative or film, by employing bichromated Bases, however, do not involve the process I --bcen properlyvexposed under anegative and developed so that it is prepared to be cast upon with molten sulfur and black lead, I

gelatin or glue and a screen or chemical grain to, form the printing block.

in the collotype or artotype process, printing is done from a gelatin plate and must be printed on specially constructed presses, similar to a lithograph. llhese procof constructing it typographic printing block, My, process differs from the above, in that l casttmy printing blocks directlyfrom the glue or. gelatin plate, and dotnot use the gelatin or glue for printing,

I In order to construct the printing block orcasting, amold is required, and tlns'mold is made from bichromated gelatin and a chemical grain or screen. fhe ordinary gelatin plate now generally used can also be employed to constitute the mold. "rte chlorid and bromid of silver contained in these plates combined with bichromatic salts till) lid hit

previously impregnated in the plates constitute the mold to make the casting and admitv the casting of a typographic printing block, from which numberless printed impressions can be easily obtained.

In order to cast directly -upon the bichro mated gelatin or glue plates described, after they have been properly exposed to daylight or artificial light under any common photographic negative and screen and then swelled up by the use of water to the desired relief,

I employ a composition of sulfur and black lead in various proportions and melted together by the minimum degree of heat required to melt sulfur. This composition or mixture is then cast directly upon the relief of the mentioned glue mold or plate, and'a suitable backing is also disposed thereon, thus constituting the desired block for typographic'printing. The backing mentioned is preferably formed of, several layers of wire oriron nails and wire netting of about pinch, t-inch, or -inch mesh, and the said backing reinforces the black lead and sulfur Photo.-

the.

1 block and preven'ts'the same from cracking or breakin The relative proportions of The mentioned composition of sulfur andblack lead can be employed also as a base for electro or stereotype plates or any other forms or kinds of plates used in photoengraving, such as copper or zinc plates,

A chemical grain for photo-mechanical printing blockscan be producedin several ways, one of'which' I will describe herewith,

After the bichromated gelatin mold has sprinkle a quantity of dry, finely powdered chlorid of sodium 011 the said gelatin mold. After the resulting block or cut is separated fro-m the mentioned mold, the fine particles Elli By means of the process described, it is easily possible to produce a printing block in less than an hour, special machinery, and it will be understood that the scope of my invention is substantially defined in the appended claims.

ll-laving thus described my invention, ll claim as new and desire to secure by Letters Patent:

1; The herein described process for prowithout the use of any ducing printing blocks, consisting in forming a mold composed of bichromated gelatin having a chemical gram or screen, and

coating the face of the mold with a compound of sulfur and black lead to derive a casting, the said casting being adapted to constitutes surface for the said printing block...

2. lhe herein described process for producing printing blocks, consisting in forming amold composed of glue having a chemical grain or screen, and coating the face of the mold with a composition of sulfur and black lead, to derive a casting, the said castlilo ire

ing being adapted to constitute a surface for the said printing block.

.3. The herein described process for pro ducing printing blocks, consisting in impregnating ,the face of a gelatin or glue plate with bichromated salts, formin a mold from said bichromated gelatin or g ue plate having a chemical grain or screen, and coating the face of the mold with a mixture of melted sulfur and black lead to form a casting, the said casting beingadapted to constitute a surface for the said printing block.

at. The herein described process for producing printing blocks, consisting in impregnating the face of a gelatin'or glue plate with a mixture of chlorid of silver, bromid of silver and bichromate salts forming a mold from said bichromated gelatin or glue plate having a chemical grain or screen, and

coating the face of said mold with a composition of sulfur and black lead to form a casting.

5. The herein described process for producing printing blocks, consisting in forming a mold composed of bichromated gelatin or glue having a chemical grain or screen, and coating the face of the mold with a compound of sulfur and black lead reinforced by a backing to derive a casting, the said casting being adapted to constitute a surface for the said printing block.

6. The herein described process for pro-c ducing printing blocks, consisting in impregnating gelatinor glue with bichromated salts, forming a mold from said'bichromated.

gelatin or glue, applying a solublesalt in fine powder to the surface of the mold to produce a chemical grain, coating the face i In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES BAECHLER.

Witnesses: l

T. A. HOFFMAN, W. 13. HOFFMAN. 

